Analysis of the step responses of laminar premixed flames to forcing by non-thermal plasma

Handle URI:
http://hdl.handle.net/10754/621731
Title:
Analysis of the step responses of laminar premixed flames to forcing by non-thermal plasma
Authors:
Lacoste, Deanna; Moeck, Jonas P.; Roberts, William L. ( 0000-0003-1999-2831 ) ; Chung, Suk-Ho ( 0000-0001-8782-312X ) ; Cha, Min Suk ( 0000-0003-4059-3421 )
Abstract:
The step responses of lean methane-air flames to non-thermal plasma forcing is reported. The experimental setup consists of an axisymmetric burner, with a nozzle made of a quartz tube. The equivalence ratio is 0.95, allowing stabilization of the flame in a V-shape or an M-shape geometry, over a central stainless steel rod. The plasma is produced by short pulses of 10-ns duration, 8-kV maximum voltage amplitude, applied at 10 kHz. The central rod is used as a cathode, while the anode is a stainless steel ring, fixed on the outer surface of the quartz tube. Plasma forcing is produced by positive or negative steps of plasma. The step response of the flame is investigated through heat release rate (HRR) fluctuations, to facilitate comparisons with flame response to acoustic perturbations. The chemiluminescence of CH* between two consecutive pulses was recorded using an intensified camera equipped with an optical filter to estimate the HRR fluctuations. First, the results show that the flame does not respond to each single plasma pulse, but is affected only by the average plasma power, confirming the step nature of the forcing. The temporal evolutions of HRR are analyzed and the flame transfer functions are determined. A forcing mechanism, as a local increase in the reactivity of the fluid close to the rod, is proposed and compared with numerical simulations. Experiments and numerical simulations are in good qualitative agreement. © 2016.
KAUST Department:
Clean Combustion Research Center
Citation:
Lacoste DA, Moeck JP, Roberts WL, Chung SH, Cha MS (2016) Analysis of the step responses of laminar premixed flames to forcing by non-thermal plasma. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.06.178.
Publisher:
Elsevier BV
Journal:
Proceedings of the Combustion Institute
Issue Date:
16-Jul-2016
DOI:
10.1016/j.proci.2016.06.178
Type:
Article
ISSN:
1540-7489
Sponsors:
King Abdullah University of Science and Technology[1975]; Deutsche Forschungsgemeinschaft[ANR-13-IS09-0004]
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorLacoste, Deannaen
dc.contributor.authorMoeck, Jonas P.en
dc.contributor.authorRoberts, William L.en
dc.contributor.authorChung, Suk-Hoen
dc.contributor.authorCha, Min Suken
dc.date.accessioned2016-11-03T13:23:45Z-
dc.date.available2016-11-03T13:23:45Z-
dc.date.issued2016-07-16en
dc.identifier.citationLacoste DA, Moeck JP, Roberts WL, Chung SH, Cha MS (2016) Analysis of the step responses of laminar premixed flames to forcing by non-thermal plasma. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.06.178.en
dc.identifier.issn1540-7489en
dc.identifier.doi10.1016/j.proci.2016.06.178en
dc.identifier.urihttp://hdl.handle.net/10754/621731-
dc.description.abstractThe step responses of lean methane-air flames to non-thermal plasma forcing is reported. The experimental setup consists of an axisymmetric burner, with a nozzle made of a quartz tube. The equivalence ratio is 0.95, allowing stabilization of the flame in a V-shape or an M-shape geometry, over a central stainless steel rod. The plasma is produced by short pulses of 10-ns duration, 8-kV maximum voltage amplitude, applied at 10 kHz. The central rod is used as a cathode, while the anode is a stainless steel ring, fixed on the outer surface of the quartz tube. Plasma forcing is produced by positive or negative steps of plasma. The step response of the flame is investigated through heat release rate (HRR) fluctuations, to facilitate comparisons with flame response to acoustic perturbations. The chemiluminescence of CH* between two consecutive pulses was recorded using an intensified camera equipped with an optical filter to estimate the HRR fluctuations. First, the results show that the flame does not respond to each single plasma pulse, but is affected only by the average plasma power, confirming the step nature of the forcing. The temporal evolutions of HRR are analyzed and the flame transfer functions are determined. A forcing mechanism, as a local increase in the reactivity of the fluid close to the rod, is proposed and compared with numerical simulations. Experiments and numerical simulations are in good qualitative agreement. © 2016.en
dc.description.sponsorshipKing Abdullah University of Science and Technology[1975]en
dc.description.sponsorshipDeutsche Forschungsgemeinschaft[ANR-13-IS09-0004]en
dc.publisherElsevier BVen
dc.subjectFlame dynamicsen
dc.titleAnalysis of the step responses of laminar premixed flames to forcing by non-thermal plasmaen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalProceedings of the Combustion Instituteen
dc.contributor.institutionTechnische Universität Berlin, Institut für Strömungsmechanik und Technische Akustik, Berlin 10623, Germanyen
kaust.authorLacoste, Deannaen
kaust.authorRoberts, William L.en
kaust.authorChung, Suk-Hoen
kaust.authorCha, Min Suken
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